forked from openvswitch/ovs
-
Notifications
You must be signed in to change notification settings - Fork 2
/
NEWS
1049 lines (1006 loc) · 52.6 KB
/
NEWS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
Post-v2.6.0
---------------------
- Utilities and daemons that support SSL now allow protocols and
ciphers to be configured with --ssl-protocols and --ssl-ciphers.
- OVN:
* QoS is now implemented via egress shaping rather than ingress policing.
* DSCP marking is now supported, via the new northbound QoS table.
* IPAM now supports fixed MAC addresses.
* Support for source IP address based routing.
- Fixed regression in table stats maintenance introduced in OVS
2.3.0, wherein the number of OpenFlow table hits and misses was
not accurate.
- OpenFlow:
* OFPT_PACKET_OUT messages are now supported in bundles.
* A new "selection_method=dp_hash" type for OpenFlow select group
bucket selection that uses the datapath computed 5-tuple hash
without making datapath flows match the 5-tuple fields, which
is useful for more efficient load balancing, for example. This
uses the Netronome extension to OpenFlow 1.5+ that allows
control over the OpenFlow select groups selection method. See
"selection_method" and related options in ovs-ofctl(8) for
details.
- ovs-ofctl:
* 'bundle' command now supports packet-out messages.
* New syntax for 'ovs-ofctl packet-out' command, which uses the
same string parser as the 'bundle' command. The old 'packet-out'
syntax is deprecated and will be removed in a later OVS
release.
* New unixctl "ofctl/packet-out" command, which can be used to
instruct a flow monitor to issue OpenFlow packet-out messages.
- ovsdb-server:
* Remote connections can now be made read-only (see ovsdb-server(1)).
- Tunnels:
* TLV mappings for protocols such as Geneve are now segregated on
a per-OpenFlow bridge basis rather than globally. (The interface
has not changed.)
* Removed support for IPsec tunnels.
- DPDK:
* New option 'n_rxq_desc' and 'n_txq_desc' fields for DPDK interfaces
which set the number of rx and tx descriptors to use for the given port.
* Support for DPDK v16.11.
- Fedora packaging:
* A package upgrade does not automatically restart OVS service.
- ovs-vswitchd/ovs-vsctl:
* Ports now have a "protected" flag. Protected ports can not forward
frames to other protected ports. Unprotected ports can receive and
forward frames to protected and other unprotected ports.
v2.6.0 - 27 Sep 2016
---------------------
- First supported release of OVN. See ovn-architecture(7) for more
details.
- ovsdb-server:
* New "monitor_cond" "monitor_cond_update" and "update2" extensions to
RFC 7047.
- OpenFlow:
* OpenFlow 1.3+ bundles now expire after 10 seconds since the
last time the bundle was either opened, modified, or closed.
* OpenFlow 1.3 Extension 230, adding OpenFlow Bundles support, is
now implemented.
* OpenFlow 1.3+ bundles are now supported for group mods as well as
flow mods and port mods. Both 'atomic' and 'ordered' bundle
flags are supported for group mods as well as flow mods.
* Internal OpenFlow rule representation for load and set-field
actions is now much more memory efficient. For a complex flow
table this can reduce rule memory consumption by 40%.
* Bundles are now much more memory efficient than in OVS 2.5.
Together with memory efficiency improvements in OpenFlow rule
representation, the peak OVS resident memory use during a
bundle commit for large complex set of flow mods can be only
25% of that in OVS 2.5 (4x lower).
* OpenFlow 1.1+ OFPT_QUEUE_GET_CONFIG_REQUEST now supports OFPP_ANY.
* OpenFlow 1.4+ OFPMP_QUEUE_DESC is now supported.
* OpenFlow 1.4+ OFPT_TABLE_STATUS is now supported.
* New property-based packet-in message format NXT_PACKET_IN2 with support
for arbitrary user-provided data and for serializing flow table
traversal into a continuation for later resumption.
* New extension message NXT_SET_ASYNC_CONFIG2 to allow OpenFlow 1.4-like
control over asynchronous messages in earlier versions of OpenFlow.
* New OpenFlow extension NXM_NX_MPLS_TTL to provide access to MPLS TTL.
* New output option, output(port=N,max_len=M), to allow truncating a
packet to size M bytes when outputting to port N.
* New command OFPGC_ADD_OR_MOD for OFPT_GROUP_MOD message that adds a
new group or modifies an existing groups
* The optional OpenFlow packet buffering feature is deprecated in
this release, and will be removed in the next OVS release
(2.7). After the change OVS always sends the 'buffer_id' as
0xffffffff in packet-in messages and will send an error
response if any other value of this field is included in
packet-out and flow mod sent by a controller. Controllers are
already expected to work properly in cases where the switch can
not buffer packets, so this change should not affect existing
users.
* New OpenFlow extension NXT_CT_FLUSH_ZONE to flush conntrack zones.
- Improved OpenFlow version compatibility for actions:
* New OpenFlow extension to support the "group" action in OpenFlow 1.0.
* OpenFlow 1.0 "enqueue" action now properly translated to OpenFlow 1.1+.
* OpenFlow 1.1 "mod_nw_ecn" and OpenFlow 1.1+ "mod_nw_ttl" actions now
properly translated to OpenFlow 1.0.
- ovs-ofctl:
* queue-get-config command now allows a queue ID to be specified.
* '--bundle' option can now be used with OpenFlow 1.3 and with group mods.
* New "bundle" command allows executing a mixture of flow and group mods
as a single atomic transaction.
* New option "--color" to produce colorized output for some commands.
* New option '--may-create' to use OFPGC_ADD_OR_MOD in mod-group command.
- IPFIX:
* New "sampling_port" option for "sample" action to allow sampling
ingress and egress tunnel metadata with IPFIX.
* New ovs-ofctl commands "dump-ipfix-bridge" and "dump-ipfix-flow" to
dump bridge IPFIX statistics and flow based IPFIX statistics.
* New setting other-config:virtual_obs_id to add an arbitrary string
to IPFIX records.
- Linux:
* OVS Linux datapath now implements Conntrack NAT action with all
supported Linux kernels.
* Support for truncate action.
* New QoS type "linux-noop" that prevents Open vSwitch from trying to
manage QoS for a given port (useful when other software manages QoS).
- DPDK:
* New option "n_rxq" for PMD interfaces.
Old 'other_config:n-dpdk-rxqs' is no longer supported.
Not supported by vHost interfaces. For them number of rx and tx queues
is applied from connected virtio device.
* New 'other_config:pmd-rxq-affinity' field for PMD interfaces, that
allows to pin port's rx queues to desired cores.
* New appctl command 'dpif-netdev/pmd-rxq-show' to check the port/rxq
assignment.
* Type of log messages from PMD threads changed from INFO to DBG.
* QoS functionality with sample egress-policer implementation.
* The mechanism for configuring DPDK has changed to use database
* Sensible defaults have been introduced for many of the required
configuration options
* DB entries have been added for many of the DPDK EAL command line
arguments. Additional arguments can be passed via the dpdk-extra
entry.
* Add ingress policing functionality.
* PMD threads servicing vHost User ports can now come from the NUMA
node that device memory is located on if CONFIG_RTE_LIBRTE_VHOST_NUMA
is enabled in DPDK.
* Basic connection tracking for the userspace datapath (no ALG,
fragmentation or NAT support yet)
* Support for DPDK 16.07
* Optional support for DPDK pdump enabled.
* Jumbo frame support
* Remove dpdkvhostcuse port type.
* OVS client mode for vHost and vHost reconnect (Requires QEMU 2.7)
* 'dpdkvhostuserclient' port type.
- Increase number of registers to 16.
- ovs-benchmark: This utility has been removed due to lack of use and
bitrot.
- ovs-appctl:
* New "vlog/close" command.
- ovs-ctl:
* Added the ability to selectively start the forwarding and database
functions (ovs-vswitchd and ovsdb-server, respectively).
- ovsdb-server:
* Remove max number of sessions limit, to enable connection scaling
testing.
- python:
* Added support for Python 3.4+ in addition to existing support
for 2.7+.
- SELinux:
* Introduced SELinux policy package.
- Datapath Linux kernel compatibility.
* Dropped support for kernel older than 3.10.
* Removed VLAN splinters feature.
* Datapath supports kernel upto 4.7.
- Tunnels:
* Flow based tunnel match and action can be used for IPv6 address using
tun_ipv6_src, tun_ipv6_dst fields.
* Added support for IPv6 tunnels, for details checkout FAQ.
* Deprecated support for IPsec tunnels ports.
- A wrapper script, 'ovs-tcpdump', to easily port-mirror an OVS port and
watch with tcpdump
- Introduce --no-self-confinement flag that allows daemons to work with
sockets outside their run directory.
- ovs-pki: Changed message digest algorithm from SHA-1 to SHA-512 because
SHA-1 is no longer secure and some operating systems have started to
disable it in OpenSSL.
- Add 'mtu_request' column to the Interface table. It can be used to
configure the MTU of the ports.
Known issues:
- Using openvswitch module in conjunction with upstream Linux tunnels:
* When using the openvswitch module distributed with OVS against kernel
versions 4.4 to 4.6, the openvswitch module cannot be loaded or used at
the same time as "ip_gre".
- Conntrack FTP ALGs: When using the openvswitch module distributed with
OVS, particular Linux distribution kernels versions may provide diminished
functionality. This typically affects active FTP data connections when
using "actions=ct(alg=ftp),..." in flow tables. Specifically:
* Centos 7.1 kernels (3.10.0-2xx) kernels are unable to correctly set
up expectations for FTP data connections in multiple zones,
eg "actions=ct(zone=1,alg=ftp),ct(zone=2,alg=ftp),...". Executing the
"ct" action for subsequent data connections may fail to determine that
the data connection is "related" to an existing connection.
* Centos 7.2 kernels (3.10.0-3xx) kernels may not establish FTP ALG state
correctly for NATed connections. As a result, flows that perform NAT,
eg "actions=ct(nat,ftp=alg,table=1),..." may fail to NAT the packet,
and will populate the "ct_state=inv" bit in the flow.
v2.5.0 - 26 Feb 2016
---------------------
- Dropped support for Python older than version 2.7. As a consequence,
using Open vSwitch 2.5 or later on XenServer 6.5 or earlier (which
have Python 2.4) requires first installing Python 2.7.
- OpenFlow:
* Group chaining (where one OpenFlow group triggers another) is
now supported.
* OpenFlow 1.4+ "importance" is now considered for flow eviction.
* OpenFlow 1.4+ OFPTC_EVICTION is now implemented.
* OpenFlow 1.4+ OFPTC_VACANCY_EVENTS is now implemented.
* OpenFlow 1.4+ OFPMP_TABLE_DESC is now implemented.
* Allow modifying the ICMPv4/ICMPv6 type and code fields.
* OpenFlow 1.4+ OFPT_SET_ASYNC_CONFIG and OFPT_GET_ASYNC_CONFIG are
now implemented.
- ovs-ofctl:
* New "out_group" keyword for OpenFlow 1.1+ matching on output group.
- Tunnels:
* Geneve tunnels can now match and set options and the OAM bit.
* The nonstandard GRE64 tunnel extension has been dropped.
- Support Multicast Listener Discovery (MLDv1 and MLDv2).
- Add 'symmetric_l3l4' and 'symmetric_l3l4+udp' hash functions.
- sFlow agent now reports tunnel and MPLS structures.
- New 'check-system-userspace', 'check-kmod' and 'check-kernel' Makefile
targets to run a new system testsuite. These tests can be run inside
a Vagrant box. See INSTALL.md for details
- Mark --syslog-target argument as deprecated. It will be removed in
the next OVS release.
- Added --user option to all daemons
- Add support for connection tracking through the new "ct" action
and "ct_state"/"ct_zone"/"ct_mark"/"ct_label" match fields. Only
available on Linux kernels with the connection tracking module loaded.
- Add experimental version of OVN. OVN, the Open Virtual Network, is a
system to support virtual network abstraction. OVN complements the
existing capabilities of OVS to add native support for virtual network
abstractions, such as virtual L2 and L3 overlays and security groups.
- RHEL packaging:
* DPDK ports may now be created via network scripts (see README.RHEL).
- DPDK:
* Requires DPDK 2.2
* Added multiqueue support to vhost-user
* Note: QEMU 2.5+ required for multiqueue support
v2.4.0 - 20 Aug 2015
---------------------
- Flow table modifications are now atomic, meaning that each packet
now sees a coherent version of the OpenFlow pipeline. For
example, if a controller removes all flows with a single OpenFlow
"flow_mod", no packet sees an intermediate version of the OpenFlow
pipeline where only some of the flows have been deleted.
- Added support for SFQ, FQ_CoDel and CoDel qdiscs.
- Add bash command-line completion support for ovs-vsctl Please check
utilities/ovs-command-compgen.INSTALL.md for how to use.
- The MAC learning feature now includes per-port fairness to mitigate
MAC flooding attacks.
- New support for a "conjunctive match" OpenFlow extension, which
allows constructing OpenFlow matches of the form "field1 in
{a,b,c...} AND field2 in {d,e,f...}" and generalizations. For details,
see documentation for the "conjunction" action in ovs-ofctl(8).
- Add bash command-line completion support for ovs-appctl/ovs-dpctl/
ovs-ofctl/ovsdb-tool commands. Please check
utilities/ovs-command-compgen.INSTALL.md for how to use.
- The "learn" action supports a new flag "delete_learned" that causes
the learned flows to be deleted when the flow with the "learn" action
is deleted.
- Basic support for the Geneve tunneling protocol. It is not yet
possible to generate or match options. This is planned for a future
release. The protocol is documented at
http://tools.ietf.org/html/draft-gross-geneve-00
- The OVS database now reports controller rate limiting statistics.
- sflow now exports information about LACP-based bonds, port names, and
OpenFlow port numbers, as well as datapath performance counters.
- ovs-dpctl functionality is now available for datapaths integrated
into ovs-vswitchd, via ovs-appctl. Some existing ovs-appctl
commands are now redundant and will be removed in a future
release. See ovs-vswitchd(8) for details.
- OpenFlow:
* OpenFlow 1.4 bundles are now supported for flow mods and port
mods. For flow mods, both 'atomic' and 'ordered' bundle flags
are trivially supported, as all bundled messages are executed
in the order they were added and all flow table modifications
are now atomic to the datapath. Port mods may not appear in
atomic bundles, as port status modifications are not atomic.
* IPv6 flow label and neighbor discovery fields are now modifiable.
* OpenFlow 1.5 extended registers are now supported.
* The OpenFlow 1.5 actset_output field is now supported.
* OpenFlow 1.5 Copy-Field action is now supported.
* OpenFlow 1.5 masked Set-Field action is now supported.
* OpenFlow 1.3+ table features requests are now supported (read-only).
* Nicira extension "move" actions may now be included in action sets.
* "resubmit" actions may now be included in action sets. The resubmit
is executed last, and only if the action set has no "output" or "group"
action.
* OpenFlow 1.4+ flow "importance" is now maintained in the flow table.
* A new Netronome extension to OpenFlow 1.5+ allows control over the
fields hashed for OpenFlow select groups. See "selection_method" and
related options in ovs-ofctl(8) for details.
- ovs-ofctl has a new '--bundle' option that makes the flow mod commands
('add-flow', 'add-flows', 'mod-flows', 'del-flows', and 'replace-flows')
use an OpenFlow 1.4 bundle to operate the modifications as a single
atomic transaction. If any of the flow mods in a transaction fail, none
of them are executed. All flow mods in a bundle appear to datapath
lookups simultaneously.
- ovs-ofctl 'add-flow' and 'add-flows' commands now accept arbitrary flow
mods as an input by allowing the flow specification to start with an
explicit 'add', 'modify', 'modify_strict', 'delete', or 'delete_strict'
keyword. A missing keyword is treated as 'add', so this is fully
backwards compatible. With the new '--bundle' option all the flow mods
are executed as a single atomic transaction using an OpenFlow 1.4 bundle.
- ovs-pki: Changed message digest algorithm from MD5 to SHA-1 because
MD5 is no longer secure and some operating systems have started to disable
it in OpenSSL.
- ovsdb-server: New OVSDB protocol extension allows inequality tests on
"optional scalar" columns. See ovsdb-server(1) for details.
- ovs-vsctl now permits immutable columns in a new row to be modified in
the same transaction that creates the row.
- test-controller has been renamed ovs-testcontroller at request of users
who find it useful for testing basic OpenFlow setups. It is still not
a necessary or desirable part of most Open vSwitch deployments.
- Support for travis-ci.org based continuous integration builds has been
added. Build failures are reported to [email protected]. See INSTALL.md
file for additional details.
- Support for the Rapid Spanning Tree Protocol (IEEE 802.1D-2004).
The implementation has been tested successfully against the Ixia Automated
Network Validation Library (ANVL).
- Stats are no longer updated on fake bond interface.
- Keep active bond slave selection across OVS restart.
- A simple wrapper script, 'ovs-docker', to integrate OVS with Docker
containers. If and when there is a native integration of Open vSwitch
with Docker, the wrapper script will be retired.
- Added support for DPDK Tunneling. VXLAN, GRE, and Geneve are supported
protocols. This is generic tunneling mechanism for userspace datapath.
- Support for multicast snooping (IGMPv1, IGMPv2 and IGMPv3)
- Support for Linux kernels up to 4.0.x
- The documentation now use the term 'destination' to mean one of syslog,
console or file for vlog logging instead of the previously used term
'facility'.
- Support for VXLAN Group Policy extension
- Initial support for the IETF Auto-Attach SPBM draft standard. This
contains rudimentary support for the LLDP protocol as needed for
Auto-Attach.
- The default OpenFlow and OVSDB ports are now the IANA-assigned
numbers. OpenFlow is 6653 and OVSDB is 6640.
- Support for DPDK vHost.
- Support for outer UDP checksums in Geneve and VXLAN.
- The kernel vports with dependencies are no longer part of the overall
openvswitch.ko but built and loaded automatically as individual kernel
modules (vport-*.ko).
- Support for STT tunneling.
- ovs-sim: New developer tool for simulating multiple OVS instances.
See ovs-sim(1) for more information.
- Support to configure method (--syslog-method argument) that determines
how daemons will talk with syslog.
- Support for "ovs-appctl vlog/list-pattern" command that lets to query
logging message format for each destination.
v2.3.0 - 14 Aug 2014
---------------------
- OpenFlow 1.1, 1.2, and 1.3 are now enabled by default in
ovs-vswitchd.
- Linux kernel datapath now has an exact match cache optimizing the
flow matching process.
- Datapath flows now have partially wildcarded tranport port field
matches. This reduces userspace upcalls, but increases the
number of different masks in the datapath. The kernel datapath
exact match cache removes the overhead of matching the incoming
packets with the larger number of masks, but when paired with an
older kernel module, some workloads may perform worse with the
new userspace.
- Compatibility with autoconf 2.63 (previously >=2.64)
v2.2.0 - Internal Release
---------------------
- Internal ports are no longer brought up by default, because it
should be an administrator task to bring up devices as they are
configured properly.
- ovs-vsctl now reports when ovs-vswitchd fails to create a new port or
bridge.
- Port creation and configuration errors are now stored in a new error
column of the Interface table and included in 'ovs-vsctl show'.
- The "ovsdbmonitor" graphical tool has been removed, because it was
poorly maintained and not widely used.
- New "check-ryu" Makefile target for running Ryu tests for OpenFlow
controllers against Open vSwitch. See INSTALL.md for details.
- Added IPFIX support for SCTP flows and templates for ICMPv4/v6 flows.
- Upon the receipt of a SIGHUP signal, ovs-vswitchd no longer reopens its
log file (it will terminate instead). Please use 'ovs-appctl vlog/reopen'
instead.
- Support for Linux kernels up to 3.14. From Kernel 3.12 onwards OVS uses
tunnel API for GRE and VXLAN.
- Added DPDK support.
- Added support for custom vlog patterns in Python
v2.1.0 - 19 Mar 2014
---------------------
- Address prefix tracking support for flow tables. New columns
"prefixes" in OVS-DB table "Flow_Table" controls which packet
header fields are used for address prefix tracking. Prefix
tracking allows the classifier to skip rules with longer than
necessary prefixes, resulting in better wildcarding for datapath
flows. Default configuration is to not use any fields for prefix
tracking. However, if any flow tables contain both exact matches
and masked matches for IP address fields, OVS performance may be
increased by using this feature.
* As of now, the fields for which prefix lookup can be enabled
are: 'tun_id', 'tun_src', 'tun_dst', 'nw_src', 'nw_dst' (or
aliases 'ip_src' and 'ip_dst'), 'ipv6_src', and 'ipv6_dst'.
(Using this feature for 'tun_id' would only make sense if the
tunnel IDs have prefix structure similar to IP addresses.)
* There is a maximum number of fields that can be enabled for any
one flow table. Currently this limit is 3.
* Examples:
$ ovs-vsctl set Bridge br0 flow_tables:0=@N1 -- \
--id=@N1 create Flow_Table name=table0
$ ovs-vsctl set Bridge br0 flow_tables:1=@N1 -- \
--id=@N1 create Flow_Table name=table1
$ ovs-vsctl set Flow_Table table0 prefixes=ip_dst,ip_src
$ ovs-vsctl set Flow_Table table1 prefixes=[]
- TCP flags matching: OVS now supports matching of TCP flags. This
has an adverse performance impact when using OVS userspace 1.10
or older (no megaflows support) together with the new OVS kernel
module. It is recommended that the kernel and userspace modules
both are upgraded at the same time.
- The default OpenFlow and OVSDB ports will change to
IANA-assigned numbers in a future release. Consider updating
your installations to specify port numbers instead of using the
defaults.
- OpenFlow:
* The OpenFlow 1.1+ "Write-Actions" instruction is now supported.
* OVS limits the OpenFlow port numbers it assigns to port 32767 and
below, leaving port numbers above that range free for assignment
by the controller.
* ovs-vswitchd now honors changes to the "ofport_request" column
in the Interface table by changing the port's OpenFlow port
number.
* The Open vSwitch software switch now supports OpenFlow groups.
- ovs-vswitchd.conf.db.5 man page will contain graphviz/dot
diagram only if graphviz package was installed at the build time.
- Support for Linux kernels up to 3.11
- ovs-dpctl:
The "show" command also displays mega flow mask stats.
- ovs-ofctl:
* New command "ofp-parse-pcap" to dump OpenFlow from PCAP files.
- ovs-controller has been renamed test-controller. It is no longer
packaged or installed by default, because too many users assumed
incorrectly that ovs-controller was a necessary or desirable part
of an Open vSwitch deployment.
- Added vlog option to export to a UDP syslog sink.
- ovsdb-client:
* The "monitor" command can now monitor all tables in a database,
instead of being limited to a single table.
- The flow-eviction-threshold has been replaced by the flow-limit which is a
hard limit on the number of flows in the datapath. It defaults to 200,000
flows. OVS automatically adjusts this number depending on network
conditions.
- Added IPv6 support for active and passive socket communications.
v2.0.0 - 15 Oct 2013
---------------------
- The ovs-vswitchd process is no longer single-threaded. Multiple
threads are now used to handle flow set up and asynchronous
logging.
- OpenFlow:
* Experimental support for OpenFlow 1.1 (in addition to 1.2 and
1.3, which had experimental support in 1.10).
* Experimental protocol support for OpenFlow 1.1+ groups. This
does not yet include an implementation in the Open vSwitch
software switch.
* Experimental protocol support for OpenFlow 1.2+ meters. This
does not yet include an implementation in the Open vSwitch
software switch.
* New support for matching outer source and destination IP address
of tunneled packets, for tunnel ports configured with the newly
added "remote_ip=flow" and "local_ip=flow" options.
* Support for matching on metadata 'pkt_mark' for interacting with
other system components. On Linux this corresponds to the skb
mark.
* Support matching, rewriting SCTP ports
- The Interface table in the database has a new "ifindex" column to
report the interface's OS-assigned ifindex.
- New "check-oftest" Makefile target for running OFTest against Open
vSwitch. See README-OFTest for details.
- The flow eviction threshold has been moved to the Open_vSwitch table.
- Database names are now mandatory when specifying ovsdb-server options
through database paths (e.g. Private key option with the database name
should look like "--private-key=db:Open_vSwitch,SSL,private_key").
- Added ovs-dev.py, a utility script helpful for Open vSwitch developers.
- Support for Linux kernels up to 3.10
- ovs-ofctl:
* New "ofp-parse" for printing OpenFlow messages read from a file.
* New commands for OpenFlow 1.1+ groups.
- Added configurable flow caching support to IPFIX exporter.
- Dropped support for Linux pre-2.6.32.
- Log file timestamps and ovsdb commit timestamps are now reported
with millisecond resolution. (Previous versions only reported
whole seconds.)
v1.11.0 - 28 Aug 2013
---------------------
- Support for megaflows, which allows wildcarding in the kernel (and
any dpif implementation that supports wildcards). Depending on
the flow table and switch configuration, flow set up rates are
close to the Linux bridge.
- The "tutorial" directory contains a new tutorial for some advanced
Open vSwitch features.
- Stable bond mode has been removed.
- The autopath action has been removed.
- New support for the data encapsulation format of the LISP tunnel
protocol (RFC 6830). An external control plane or manual flow
setup is required for EID-to-RLOC mapping.
- OpenFlow:
* The "dec_mpls_ttl" and "set_mpls_ttl" actions from OpenFlow
1.1 and later are now implemented.
* New "stack" extension for use in actions, to push and pop from
NXM fields.
* The "load" and "set_field" actions can now modify the "in_port". (This
allows one to enable output to a flow's input port by setting the
in_port to some unused value, such as OFPP_NONE.)
- ovs-dpctl:
* New debugging commands "add-flow", "mod-flow", "del-flow".
* "dump-flows" now has a -m option to increase output verbosity.
- In dpif-based bridges, cache action translations, which can improve
flow set up performance by 80% with a complicated flow table.
- New syslog format, prefixed with "ovs|", to be easier to filter.
- RHEL: Removes the default firewall rule that allowed GRE traffic to
pass through. Any users that relied on this automatic firewall hole
will have to manually configure it. The ovs-ctl(8) manpage documents
the "enable-protocol" command that can be used as an alternative.
- New CFM demand mode which uses data traffic to indicate interface
liveness.
v1.10.0 - 01 May 2013
---------------------
- Bridge compatibility support has been removed. Any uses that
rely on ovs-brcompatd will have to stick with Open vSwitch 1.9.x
or adapt to native Open vSwitch support (e.g. use ovs-vsctl instead
of brctl).
- The maximum size of the MAC learning table is now configurable.
- With the Linux datapath, packets for new flows are now queued
separately on a per-port basis, so it should no longer be
possible for a large number of new flows arriving on one port to
prevent new flows from being processed on other ports.
- ovs-vsctl:
* Previously ovs-vsctl would retry connecting to the database forever,
causing it to hang if ovsdb-server was not running. Now, ovs-vsctl
only tries once by default (use --retry to try forever). This change
means that you may want to remove uses of --timeout to avoid hangs
in ovs-vsctl calls.
* Many "ovs-vsctl" database commands now accept an --if-exists option.
Please refer to the ovs-vsctl manpage for details.
- OpenFlow:
- Experimental support for newer versions of OpenFlow. See
the "What versions of OpenFlow does Open vSwitch support?"
question in the FAQ for more details.
- The OpenFlow "dp_desc" may now be configured by setting the
value of other-config:dp-desc in the Bridge table.
- It is possible to request the OpenFlow port number with the
"ofport_request" column in the Interface table.
- The NXM flow_removed message now reports the OpenFlow table ID
from which the flow was removed.
- Tunneling:
- New support for the VXLAN tunnel protocol (see the IETF draft here:
http://tools.ietf.org/html/draft-mahalingam-dutt-dcops-vxlan-03).
- Tunneling requires the version of the kernel module paired with
Open vSwitch 1.9.0 or later.
- Inheritance of the Don't Fragment bit in IP tunnels (df_inherit)
is no longer supported.
- Path MTU discovery is no longer supported.
- CAPWAP tunneling support removed.
- Tunnels with multicast destination ports are no longer supported.
- ovs-dpctl:
- The "dump-flows" and "del-flows" no longer require an argument
if only one datapath exists.
- ovs-appctl:
- New "vlog/disable-rate-limit" and "vlog/enable-rate-limit"
commands available allow control over logging rate limits.
- New "dpif/dump-dps", "dpif/show", and "dpif/dump-flows" command
that mimic the equivalent ovs-dpctl commands.
- The ofproto library is now responsible for assigning OpenFlow port
numbers. An ofproto implementation should assign them when
port_construct() is called.
- All dpif-based bridges of a particular type share a common
datapath called "ovs-<type>", e.g. "ovs-system". The ovs-dpctl
commands will now return information on that shared datapath. To
get the equivalent bridge-specific information, use the new
"ovs-appctl dpif/*" commands.
- Backward-incompatible changes:
- Earlier Open vSwitch versions treated ANY as a wildcard in flow
syntax. OpenFlow 1.1 adds a port named ANY, which introduces a
conflict. ANY was rarely used in flow syntax, so we chose to
retire that meaning of ANY in favor of the OpenFlow 1.1 meaning.
- Patch ports no longer require kernel support, so they now work
with FreeBSD and the kernel module built into Linux 3.3 and later.
- New "sample" action.
v1.9.0 - 26 Feb 2013
------------------------
- Datapath:
- Support for ipv6 set action.
- SKB mark matching and setting.
- support for Linux kernels up to 3.8
- FreeBSD is now a supported platform, thanks to code contributions from
Gaetano Catalli, Ed Maste, and Giuseppe Lettieri.
- ovs-bugtool: New --ovs option to report only OVS related information.
- New %t and %T log escapes to identify the subprogram within a
cooperating group of processes or threads that emitted a log message.
The default log patterns now include this information.
- OpenFlow:
- Allow bitwise masking for SHA and THA fields in ARP, SLL and TLL
fields in IPv6 neighbor discovery messages, and IPv6 flow label.
- Adds support for writing to the metadata field for a flow.
- Tunneling:
- The tunneling code no longer assumes input and output keys are
symmetric. If they are not, PMTUD needs to be disabled for
tunneling to work. Note this only applies to flow-based keys.
- New support for a nonstandard form of GRE that supports a 64-bit key.
- Tunnel Path MTU Discovery default value was set to 'disabled'.
This feature is deprecated and will be removed soon.
- Tunnel header caching removed.
- ovs-ofctl:
- Commands and actions that accept port numbers now also accept keywords
that represent those ports (such as LOCAL, NONE, and ALL). This is
also the recommended way to specify these ports, for compatibility
with OpenFlow 1.1 and later (which use the OpenFlow 1.0 numbers
for these ports for different purposes).
- ovs-dpctl:
- Support requesting the port number with the "port_no" option in
the "add-if" command.
- ovs-pki: The "online PKI" features have been removed, along with
the ovs-pki-cgi program that facilitated it, because of some
alarmist insecurity claims. We do not believe that these claims
are true, but because we do not know of any users for this
feature it seems better on balance to remove it. (The ovs-pki-cgi
program was not included in distribution packaging.)
- ovsdb-server now enforces the immutability of immutable columns. This
was not enforced in earlier versions due to an oversight.
- The following features are now deprecated. They will be removed no
earlier than February 2013. Please email [email protected] with
concerns.
- Bridge compatibility.
- Stable bond mode.
- The autopath action.
- Interface type "null".
- Numeric values for reserved ports (see "ovs-ofctl" note above).
- Tunnel Path MTU Discovery.
- CAPWAP tunnel support.
- The data in the RARP packets can now be matched in the same way as the
data in ARP packets.
v1.8.0 - 26 Feb 2013
------------------------
*** Internal only release ***
- New FAQ. Please send updates and additions!
- Authors of controllers, please read the new section titled "Action
Reproduction" in DESIGN, which describes an Open vSwitch change in
behavior in corner cases that may affect some controllers.
- ovs-l3ping:
- A new test utility that can create L3 tunnel between two Open
vSwitches and detect connectivity issues.
- ovs-ofctl:
- New --sort and --rsort options for "dump-flows" command.
- "mod-port" command can now control all OpenFlow config flags.
- OpenFlow:
- Allow general bitwise masking for IPv4 and IPv6 addresses in
IPv4, IPv6, and ARP packets. (Previously, only CIDR masks
were allowed.)
- Allow support for arbitrary Ethernet masks. (Previously, only
the multicast bit in the destination address could be individually
masked.)
- New field OXM_OF_METADATA, to align with OpenFlow 1.1.
- The OFPST_QUEUE request now reports an error if a specified port or
queue does not exist, or for requests for a specific queue on all
ports, if the specified queue does not exist on any port. (Previous
versions generally reported an empty set of results.)
- New "flow monitor" feature to allow controllers to be notified of
flow table changes as they happen.
- Additional protocols are not mirrored and dropped when forward-bpdu is
false. For a full list, see the ovs-vswitchd.conf.db man page.
- Open vSwitch now sends RARP packets in situations where it previously
sent a custom protocol, making it consistent with behavior of QEMU and
VMware.
- All Open vSwitch programs and log files now show timestamps in UTC,
instead the local timezone, by default.
v1.7.0 - 30 Jul 2012
------------------------
- kernel modules are renamed. openvswitch_mod.ko is now
openvswitch.ko and brcompat_mod.ko is now brcompat.ko.
- Increased the number of NXM registers to 8.
- Added ability to configure DSCP setting for manager and controller
connections. By default, these connections have a DSCP value of
Internetwork Control (0xc0).
- Added the granular link health statistics, 'cfm_health', to an
interface.
- OpenFlow:
- Added support to mask nd_target for ICMPv6 neighbor discovery flows.
- Added support for OpenFlow 1.3 port description (OFPMP_PORT_DESC)
multipart messages.
- ovs-ofctl:
- Added the "dump-ports-desc" command to retrieve port
information using the new port description multipart messages.
- ovs-test:
- Added support for spawning ovs-test server from the client.
- Now ovs-test is able to automatically create test bridges and ports.
- "ovs-dpctl dump-flows" now prints observed TCP flags in TCP flows.
- Tripled flow setup performance.
- The "coverage/log" command previously available through ovs-appctl
has been replaced by "coverage/show". The new command replies with
coverage counter values, instead of logging them.
v1.6.1 - 25 Jun 2012
------------------------
- Allow OFPP_CONTROLLER as the in_port for packet-out messages.
v1.6.0 - 24 Feb 2012
------------------------
*** Internal only release ***
- bonding
- LACP bonds no longer fall back to balance-slb when negotiations fail.
Instead they drop traffic.
- The default bond_mode changed from SLB to active-backup, to protect
unsuspecting users from the significant risks of SLB bonds (which are
documented in vswitchd/INTERNALS).
- Load balancing can be disabled by setting the bond-rebalance-interval
to zero.
- OpenFlow:
- Added support for bitwise matching on TCP and UDP ports.
See ovs-ofctl(8) for more information.
- NXM flow dumps now include times elapsed toward idle and hard
timeouts.
- Added an OpenFlow extension NXT_SET_ASYNC_CONFIG that allows
controllers more precise control over which OpenFlow messages they
receive asynchronously.
- New "fin_timeout" action.
- Added "fin_timeout" support to "learn" action.
- New Nicira action NXAST_CONTROLLER that offers additional features
over output to OFPP_CONTROLLER.
- When QoS settings for an interface do not configure a default queue
(queue 0), Open vSwitch now uses a default configuration for that
queue, instead of dropping all packets as in previous versions.
- Logging:
- Logging to console and file will have UTC timestamp as a default for
all the daemons. An example of the default format is
2012-01-27T16:35:17Z. ovs-appctl can be used to change the default
format as before.
- The syntax of commands and options to set log levels was simplified,
to make it easier to remember.
- New support for limiting the number of flows in an OpenFlow flow
table, with configurable policy for evicting flows upon
overflow. See the Flow_Table table in ovs-vswitch.conf.db(5)
for more information.
- New "enable-async-messages" column in the Controller table. If set to
false, OpenFlow connections to the controller will initially have all
asynchronous messages disabled, overriding normal OpenFlow behavior.
- ofproto-provider interface:
- "struct rule" has a new member "used" that ofproto implementations
should maintain by updating with ofproto_rule_update_used().
- ovsdb-client:
- The new option --timestamp causes the "monitor" command to print
a timestamp with every update.
- CFM module CCM broadcasts can now be tagged with an 802.1p priority.
v1.5.0 - 01 Jun 2012
------------------------
- OpenFlow:
- Added support for querying, modifying, and deleting flows
based on flow cookie when using NXM.
- Added new NXM_PACKET_IN format.
- Added new NXAST_DEC_TTL action.
- ovs-ofctl:
- Added daemonization support to the monitor and snoop commands.
- ovs-vsctl:
- The "find" command supports new set relational operators
{=}, {!=}, {<}, {>}, {<=}, and {>=}.
- ovsdb-tool now uses the typical database and schema installation
directories as defaults.
- The default MAC learning timeout has been increased from 60 seconds
to 300 seconds. The MAC learning timeout is now configurable.
v1.4.0 - 30 Jan 2012
------------------------
- Compatible with Open vSwitch kernel module included in Linux 3.3.
- New "VLAN splinters" feature to work around buggy device drivers
in old Linux versions. (This feature is deprecated. When
broken device drivers are no longer in widespread use, we will
delete this feature.) See ovs-vswitchd.conf.db(5) for more
information.
- OpenFlow:
- Added ability to match on IPv6 flow label through NXM.
- Added ability to match on ECN bits in IPv4 and IPv6 through NXM.
- Added ability to match on TTL in IPv4 and IPv6 through NXM.
- Added ability to modify ECN bits in IPv4.
- Added ability to modify TTL in IPv4.
- ovs-vswitchd:
- Don't require the "normal" action to use mirrors. Traffic will
now be properly mirrored for any flows, regardless of their
actions.
- Track packet and byte statistics sent on mirrors.
- The sFlow implementation can now usually infer the correct agent
device instead of having to be told explicitly.
- ovs-appctl:
- New "fdb/flush" command to flush bridge's MAC learning table.
- ovs-test:
- A new distributed testing tool that allows one to diagnose performance
and connectivity issues. This tool currently is not included in RH or
Xen packages.
- RHEL packaging now supports integration with Red Hat network scripts.
- bonding:
- Post 1.4.*, OVS will be changing the default bond mode from balance-slb
to active-backup. SLB bonds carry significant risks with them
(documented vswitchd/INTERNALS) which we want to prevent unsuspecting
users from running into. Users are advised to update any scripts or
configuration which may be negatively impacted by explicitly setting
the bond mode which they want to use.
v1.3.0 - 09 Dec 2011
------------------------
- OpenFlow:
- Added an OpenFlow extension which allows the "output" action to accept
NXM fields.
- Added an OpenFlow extension for flexible learning.
- Bumped number of NXM registers from four to five.
- ovs-appctl:
- New "version" command to determine version of running daemon.
- If no argument is provided for "cfm/show", displays detailed
information about all interfaces with CFM enabled.
- If no argument is provided for "lacp/show", displays detailed
information about all ports with LACP enabled.
- ovs-dpctl:
- New "set-if" command to modify a datapath port's configuration.
- ovs-vswitchd:
- The software switch now supports 255 OpenFlow tables, instead
of just one. By default, only table 0 is consulted, but the
new NXAST_RESUBMIT_TABLE action can look up in additional
tables. Tables 128 and above are reserved for use by the
switch itself; please use only tables 0 through 127.
- Add support for 802.1D spanning tree (STP).
- Fragment handling extensions:
- New OFPC_FRAG_NX_MATCH fragment handling mode, in which L4
fields are made available for matching in fragments with
offset 0.
- New NXM_NX_IP_FRAG match field for matching IP fragments (usable
via "ip_frag" in ovs-ofctl).
- New ovs-ofctl "get-frags" and "set-frags" commands to get and set
fragment handling policy.
- CAPWAP tunneling now supports an extension to transport a 64-bit key.
By default it remains compatible with the old version and other
standards-based implementations.
- Flow setups are now processed in a round-robin manner across ports
to prevent any single client from monopolizing the CPU and conducting
a denial of service attack.
- Added support for native VLAN tagging. A new "vlan_mode"
parameter can be set for "port". Possible values: "access",
"trunk", "native-tagged" and "native-untagged".
- test-openflowd has been removed. Please use ovs-vswitchd instead.
v1.2.0 - 03 Aug 2011
------------------------
- New "ofproto" abstraction layer to ease porting to hardware
switching ASICs.
- Packaging for Red Hat Enterprise Linux 5.6 and 6.0.
- Datapath support for Linux kernels up to 3.0.
- OpenFlow:
- New "bundle" and "bundle_load" action extensions.
- Database:
- Implement table unique constraints.
- Support cooperative locking between callers.
- ovs-dpctl:
- New "-s" option for "show" command prints packet and byte
counters for each port.
- ovs-ofctl:
- New "--readd" option for "replace-flows".
- ovs-vsctl:
- New "show" command to print an overview of configuration.
- New "comment" command to add remark that explains intentions.
- ovs-brcompatd has been rewritten to fix long-standing bugs.
- ovs-openflowd has been renamed test-openflowd and moved into the
tests directory. Its presence confused too many users. Please
use ovs-vswitchd instead.
- New ovs-benchmark utility to test flow setup performance.
- A new log level "off" has been added. Configuring a log facility
"off" prevents any messages from being logged to it. Previously,
"emer" was effectively "off" because no messages were ever logged at
level "emer". Now, errors that cause a process to exit are logged
at "emer" level.
- "configure" option --with-l26 has been renamed --with-linux, and
--with-l26-source has been renamed --with-linux-source. The old
names will be removed after the next release, so please update
your scripts.
- The "-2.6" suffix has been dropped from the datapath/linux-2.6 and
datapath/linux-2.6/compat-2.6 directories.
- Feature removals:
- Dropped support for "tun_id_from_cookie" OpenFlow extension.
Please use the extensible match extensions instead.
- Removed the Maintenance_Point and Monitor tables in an effort
to simplify 802.1ag configuration.
- Performance and scalability improvements
- Bug fixes
v1.1.0 - 05 Apr 2011
------------------------
- Ability to define policies over IPv6
- LACP
- 802.1ag CCM
- Support for extensible match extensions to OpenFlow
- QoS:
- Support for HFSC qdisc.
- Queue used by in-band control can now be configured.
- Kernel:
- Kernel<->userspace interface has been reworked and should be
close to a stable ABI now.
- "Port group" concept has been dropped.
- GRE over IPSEC tunnels
- Bonding:
- New active backup bonding mode.
- New L4 hashing support when LACP is enabled.
- Source MAC hash now includes VLAN field also.
- miimon support.
- Greatly improved handling of large flow tables
- ovs-dpctl:
- "show" command now prints full vport configuration.
- "dump-groups" command removed since kernel support for
port groups was dropped.
- ovs-vsctl:
- New commands for working with the new Managers table.
- "list" command enhanced with new formatting options and --columns
option.
- "get" command now accepts new --id option.
- New "find" command.
- ovs-ofctl:
- New "queue-stats" command for printing queue stats.
- New commands "replace-flows" and "diff-flows".
- Commands to add and remove flows can now read from files.
- New --flow-format option to enable or disable NXM.
- New --more option to increase OpenFlow message verbosity.
- Removed "tun-cookie" command, which is no longer useful.
- ovs-controller enhancements for testing various features.
- New ovs-vlan-test command for testing for Linux kernel driver VLAN
bugs. New ovs-vlan-bug-workaround command for enabling and
disabling a workaround for these driver bugs.
- OpenFlow support:
- "Resubmit" actions now update flow statistics.
- New "register" extension for use in matching and actions, via NXM.
- New "multipath" experimental action extension.
- New support for matching multicast Ethernet frames, via NXM.
- New extension for OpenFlow vendor error codes.
- New extension to set the QoS output queue without actually
sending to an output port.
- Open vSwitch now reports a single flow table, instead of
separate hash and wildcard tables. This better models the
current implementation.
- New experimental "note" action.
- New "ofproto/trace" ovs-appctl command and associated utilities
to ease debugging complex flow tables.
- Database:
- Schema documentation now includes an entity-relationship diagram.
- The database is now garbage collected. In most tables,
unreferenced rows will be deleted automatically.
- Many tables now include statistics updated periodically by
ovs-vswitchd or ovsdb-server.
- Every table now has an "external-ids" column for use by OVS
integrators.
- There is no default controller anymore. Each bridge must have its
controller individually specified.
- The "fail-mode" is now a property of a Bridge instead of a Controller.
- New versioning and checksum features.
- New Managers table and manager_options column in Open_vSwitch table
for specifying managers. The old "managers" column in the
Open_vSwitch table has been removed.
- Many "name" columns are now immutable.
- Feature removals:
- Dropped support for XenServer pre-5.6.100.
- Dropped support for Linux pre-2.6.18.
- Dropped controller discovery support.
- Dropped "ovs-ofctl status" and the OpenFlow extension that it used.
Statistics reporting in the database is a rough equivalent.
- Dropped the "corekeeper" package (now separate, at
http://openvswitch.org/cgi-bin/gitweb.cgi?p=corekeeper).
- Performance and scalability improvements
- Bug fixes
v1.1.0pre2 - 13 Sep 2010
------------------------
- Bug fixes